public static FILE_FS_ATTRIBUTE_INFORMATION FromBuffer(IntPtr buffer)
{
FILE_FS_ATTRIBUTE_INFORMATION ret = new FILE_FS_ATTRIBUTE_INFORMATION();
ret.VolumeAttributes = (VolumeCaps)IOhelper.PtrToUint(buffer, 0);
ret.MaximumComponentNameLength = Marshal.ReadInt32(buffer, 4);
ret.FileSystemNameLength = IOhelper.PtrToUint(buffer, 8);
ret.FileSystemName = IOhelper.PtrToStringUni(buffer, 12, ((int)ret.FileSystemNameLength) / 2);
return(ret);
}
public static FILE_FS_ATTRIBUTE_INFORMATION GetFileVolumeAttributeInfo(IntPtr file_handle, IntPtr buffer, int buffer_len)
{
IO_STATUS_BLOCK status = new IO_STATUS_BLOCK();
bool need_free_buffer = false;
IntPtr ret_buffer = buffer;
int ret_buffer_len = buffer_len;
try
{
if (buffer_len == 0)
{
need_free_buffer = true;
ret_buffer_len = VOLUME_INFO_BUFFER_LEN;
ret_buffer = Marshal.AllocHGlobal(VOLUME_INFO_BUFFER_LEN);
}
uint res = ntApiFS.NtQueryVolumeInformationFile
(file_handle,
ref status,
ret_buffer,
ret_buffer_len,
FS_INFORMATION_CLASS.FileFsAttributeInformation);
//check res
NTSTATUS_helper.ThrowOnError(res, status, NTSTATUS_severity.Warning);
FILE_FS_ATTRIBUTE_INFORMATION ret = FILE_FS_ATTRIBUTE_INFORMATION.FromBuffer(ret_buffer);
return(ret);
}
finally
{
if (need_free_buffer)
{
Marshal.FreeHGlobal(ret_buffer);
}
}
}
public static FILE_FS_ATTRIBUTE_INFORMATION GetFileVolumeAttributeInfo(string file_name)
{
IntPtr file_handle = IntPtr.Zero;
try
{
file_handle = WinApiFS.CreateFile_intptr
(file_name,
Win32FileAccess.GENERIC_READ,
FileShare.ReadWrite,
IntPtr.Zero,
FileMode.Open,
CreateFileOptions.None,
IntPtr.Zero);
if (file_handle.ToInt32() == WinApiFS.INVALID_HANDLE_VALUE)
{
int win_err = Marshal.GetLastWin32Error();
Win32Exception ex = new Win32Exception(win_err);
throw ex;
}
FILE_FS_ATTRIBUTE_INFORMATION ret = GetFileVolumeAttributeInfo
(file_handle,
IntPtr.Zero,
0);
return(ret);
}
finally
{
if ((file_handle != IntPtr.Zero) && (file_handle.ToInt32() != WinApiFS.INVALID_HANDLE_VALUE))
{
WinApiFS.CloseHandle(file_handle);
}
}
}
